Generalised predictability in the synthesis of biocarbons as clean energy materials: targeted high performance CO2 and CH4 storage,Energy & Environmental Science

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Generalised predictability in the synthesis of biocarbons as clean energy materials: targeted high performance CO2 and CH4 storage
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2022-09-28 , DOI: 10.1039/d2ee02322a
Ibtisam Alali _{1,

2} , Robert Mokaya ₁

Affiliation

This work shows how knowledge of any biomass and choice of carbonisation process can offer a generalised route to predictability in the preparation of activated biocarbons. We demonstrate that based on O/C ratio of carbonaceous matter, it is possible to predictably generate biocarbons with suitable porosity, surface area density, volumetric surface area and packing density targeted towards record levels of CO₂ and CH₄ storage capacity. Highly porous carbons with controlled levels of microporosity of up to 97% of the surface area and 92% of the pore volume are generated. The level of synthetic control is such that it enables, on the one hand, exceptional CO₂ storage at 25 °C and low pressure (1.5 and 5.4 mmol g⁻¹ at 0.15 and 1 bar, respectively) or moderate pressure (23.7 mmol g⁻¹ at 20 bar), indicating superior uptake under both post-combustion and pre-combustion CO₂ capture conditions. The carbons may also be directed towards storing record levels of methane; at 25 °C and 100 bar, volumetric methane uptake of between 309 and 334 cm³ (STP) cm⁻³ was obtained, which values are considerably higher than all current benchmark materials and, moreover, surpass the United States Department of Energy (US DOE) target of 263 cm³ (STP) cm⁻³. Crucially, the carbons also have very attractive working capacity (deliverable methane for 100–5 bar) of 262 cm³ (STP) cm⁻³, 234 cm³ (STP) cm⁻³ (80–5 bar), and 210 cm³ (STP) cm⁻³ (65–5 bar).

中文翻译：

作为清洁能源材料的生物碳合成中的广义可预测性：有针对性的高性能 CO2 和 CH4 存储

这项工作展示了任何生物质的知识和碳化过程的选择如何为活性生物碳制备中的可预测性提供通用途径。我们证明，基于碳质物质的 O/C 比，可以预测地生成具有合适孔隙率、表面积密度、体积表面积和堆积密度的生物碳，以达到创纪录的 CO ₂和 CH ₄存储容量水平。产生具有高达 97% 的表面积和 92% 的孔体积的受控微孔率水平的高度多孔碳。合成控制水平使得一方面能够^在25 °C 和低压（1.5 和 5.4 mmol g _-1分别在 0.15 和 1 bar）或中等压力（在 20 bar 下为 23.7 mmol g ^-1），表明在燃烧后和燃烧前 CO ₂捕获条件下均具有出色的吸收能力。碳还可以用于储存创纪录水平的甲烷；^{在 25 °C 和 100 bar 的压力下，获得了 309 至 334 cm 3} (STP) cm ^-3之间的体积甲烷吸收量，该值大大高于所有当前的基准材料，而且超过了美国能源部（US DOE) 263 cm ³ (STP) cm ^-3的目标。至关重要的是，碳还具有 262 cm ³ (STP) cm ^{-3的非常有吸引力的工作能力（100-5 bar 的可输送甲烷）}, 234 cm ³ (STP) cm ^-3 (80–5 bar) 和 210 cm ³ (STP) cm ^-3 (65–5 bar)。

更新日期：2022-09-28

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